Shares of Prosterm Info Systems Ltd. surged nearly 15% in trading on Tuesday, December 2, extending a remarkable rally. The company, known for manufacturing and selling energy storage and power conditioning equipment—including various types of UPS systems—has seen its stock gain in five out of the last six trading sessions, climbing over 30% in that period.

This latest upmove has propelled the stock to nearly double from its issue price of ₹105 per share, following its market debut in June this year.

Tuesday's session was marked by exceptionally high activity. A record 4.1 crore shares were traded as of 3 PM, dwarfing the 20-day average of just 12.5 lakh shares. The trading value so far has reached approximately ₹900 crore. This figure is notable as it exceeds three times the company's free float market capitalization of ₹268 crore and is nearly on par with its overall market capitalization of ₹1,155 crore.

Attention now turns to Friday, December 5, a key date for the stock as its six-month shareholder lock-in period concludes. According to Nuvama Alternative & Quantitative Research, the end of this lock-in will free up 3.1 crore shares, representing 53% of the company's outstanding equity. Based on the current market price, the total value of shares eligible for trade starting Friday is nearly ₹630 crore.

It is important to note that the expiry of the lock-in period does not automatically mean these shares will be sold; it simply makes them eligible for trading on the open market.

After hitting an intraday high of ₹208.65, the stock cooled off slightly from its peak. Shares of Prosterm Info Systems were last trading 11.3% higher at ₹198.